Catching Interrupts

Bruce Robinson bndrobinson at
Wed Oct 13 05:43:09 UTC 2004

Hi Mark,

I've got the opposite problem! I have a MIPS processor getting interrupts
from an unused serial port and I can't shut them off. By default, RTEMS
built for mips3 enables all interrupts.

I've been working on 2 different MIPS CPU/BSP's for the past few months. One
of the toughest problems I'm having is the exception/interrupt handler code
that is common to all MIPS derivatives. Unless you have other interrupt
sources working, I would suggest checking the exception handler code very
carefully. It's likely the standard RTEMS code doesn't match your CPU
hardware exactly. Specifically, how are the interrupt pending flags
implemented on the AU1000. Does it have an internal interrupt controller
that reports the interrupt source in a non-standard way?

Wish I could be more help, but I couldn't get the AU1000 specification. Good

Best Regards,
Bruce Robinson

> -----Original Message-----
> From: Mark VanderVoord [mailto:markvandervoord at]
> Sent: Tuesday, October 12, 2004 4:16 AM
> To: rtems-users at
> Subject: Catching Interrupts
> I am attempting to write a response to an interrupt
> under RTEMS for the MIPS AU1100.  I must be missing
> something, though, as the handler is never called.  I
> register the handler as follows:

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